Boring-bar.



PATENTED DEC. 19, 1905.

C. M. LOYD.

BORING BAR.

APPLICATION FILED DEC. 31. 1904.

t 0 .r. w a U L 1 a Witwepsao UNITED STATES PATENT ornrcn.

BORING-BAR.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application file December 31,1904 Serial No. 239,251.

mum degree of simplicity and which may be readily applied preparatory tooperation thereof and removed after the cylinder has been properlytrued. The invention relates, primarily, to the specific form ofattaching means utilized to support the boring-bar, as the device isordinarily called, so that the same is firmly held in proper alinementin the cylinder in which it is being operated, and, fur- 1 ther, theinvention comprises peculiar adjusting mechanism for advancing thecutter-head of the bar.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings. 4

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodimentthereof is shown in the accompanying drawings, in which Figure 1 is alongitudinal vertical sectional view of the invention as when applied toan engine-cylinder. Fig. 2 is a vertical transverse sectional viewthrough the cutter-head, showing more clearly the mounting of the cutterand the adjusting means therefor. Fig. 3 is a vertical sectional viewtaken about on the line a; m of Fig. 1, looking in the direction of thearrow.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

In the adaptation of the invention shown in the drawings anengine-cylinder 1 of common form is illustrated, the boring-bar orsupport 2 being located in operative position therein. The bar 2 is heldin proper position at the open end of the cylinder 1 by means of asupporting-plate 3, which is attached, by means of bolts 4, preferably,to the flange 5 of the cylinder, against which the cylinder-head isordinarily secured. The head of the cylinder 1 is of course removed whenthe boring-bar 2 is used, and the plate 3 is slotted at its oppositeends, as shown at 6, in order that the same may be adjusted properly toexactly aline the boring-bar within the cylinder. The closed end of thecylinder 1 supports the boring-bar also, an end of the latter beingjournaled at this portion of the cylinder, projecting therethrough, asshown at 7. The closed ends of the engine-cylinders are usually providedwith a tubular extension 8 for packing purposes,and this extension whenthe boring-bar 2 is in position is used to receive a bushing 9, the boreof which is exactly the same size as the adjacent end of the boring-bar2, so that said end may be snugly received and journaled in the bushing.Anut 10 is adapted to be screwed upon a threaded stem 11, which projectsfrom the end of the boring-bar 2, and this nut 10 is reduced so that aportion thereof may be readily received within the bushing 9 to assistin supporting the boring-bar in a centralized position. A jam-nut 12screws against the nut 10 to prevent displacement of the latter, and inthe operation of the invention the nuts 19 and 11 are adapted to rotatewith the boring-bar 2 as the same is being operated. The boring-bar .2has mounted thereon the cutter-head 13, having an opening between itsends receiving the bar 2. The cutter-head 13 is recessed upon oppositesides at one end thereof, and the recessed portions receivecutting-tools 14:, one of which is usually a roughingtool, whereas theother is a smoothing-tool. The head 13, which operates with the bar 2,is providedwith adjusting means cooperating with a feed-screw 15,mounted upon the bar 2, said feed-screw 15 being designed to advance thehead 13 in the cutting operation. The adjusting means mentioned consistof a set-stem 16, adapted to be secured into the threaded portion of anopening 18, which leads from the extremity of the cutter-head 13opposite that having the cutters 14 thereon to the opening of the head,through which the boring-bar 2 passes. The stem 16 is adapted to adjustan adjusting element 17, having swivel connection with the innerextremity of the stem 16, as shown at 19. The element 17 is providedwith an opening 20 transversely thereof, from which the screw 15 passes,and this opening 20 is slightly elongated to permit of a slight movementof the element 17 under the actuation of the stem 16. The element 17 isthreaded at one extremity of the opening 20 therethrough, so that as thescrew 15is rotated when the threads of said screw are in engagement withthose of the element 17 the cutter-head will be gradually advancedwithin the cylinder in an obvious manner.

The boring-bar 2 is operated by any suitable power, and for this purposean arm 21 is projected from the plate 8 and supports a short shaft 22,upon which are mounted a toothed pinion 23 and a loose pulley 24. The

pinion 23 is provided with a pulley extension 25 integraltherewith, andsaid pinion is in mesh with a gear-wheel 26, keyed to the bar 2, asshown at 27. The gear-wheel 26 is located adjacent the outer end of thebar 2 and operates exterior of the cylinder 1 in the actual use of theinvention, as also does the several transmitting devices abovementioned. Power may be applied to the pulley 24: by a belt or similardevice, and when it is desired to operate-the bar 2 said belt is thrownupon the extension 25 of the pinion 23, and motion is thus transmittedto the bar 2 through the medium of the gear-wheel 26. It will beunderstood, however, that any suitable means other than that illustratedmay be provided for driving the pinion 23 or bar 2, and under certainconditions a crank-handle may be suitably provided for actuation ofthese parts. A suitable tappet 28,is mounted upon the screw 15 adjacentthe outer end of this screw, the portion of the screw device 15 uponwhich the tappet is mounted being squared, as shown most clearly in Fig.3 of the drawings, in order that the tappet will be caused to rotate thescrew under actual conditions of service. The tappet 28 is slidablymounted upon thescrew 15, so that the said tappet may be moved into aposition in which it will be struck by a stop 29, projected from theplate 8, or in a position in which it will not be actuated by thismember 29. The outer end of the screw 15 is provided with a small crank30, by which the screw may be operated in order to reverse the movementof the cutterhead 13 after the latter has been advanced the entirelength of the cylinder in effecting the truing of the same. Specificallydescribing the operation of the invention, the parts being arranged inthe position shown in Fig. 1,

as power is communicated to the boring-bar 2 through suitable means,such-as illustrated, said bar is constantly rotated. As the bar 2 isrotated the tappet 28, which has previously been disposed in a positionin which it will cooperate with the stop 29, will strike said stop at apredetermined point in the revolution of the bar 2, giving a slightrotary movement to the screw 15. The slight rotary movement of the screw15 advances the cutter-head 13 gradually until said cutter has moved theentire length of the cylinder 1.

To reverse the movement of the cutter-head, it is only necessary tothrow the tappet 28 away from the stop 29, whereupon the crank 30 may bereadily actuated and the head 13 quickly brought into a positionadjacent the outer extremity of the cylinder. If necessary, theadjusting element 17 may be operated by the stem 16 so as to throw thethreaded portion of the element 17 away from the corresponding portionof the screw 15, and this will admit of free slidable movement of thecutter-head longitudinally of the bar 2. It will of course be understoodthat the screw 15 is received in a slot arranged longitudinally of thebar 2, and the inner end of the adjusting element 17, projecting intothis slot, forms a key, which necessitates rotation of the cutter-headwith the bar 2.

Having thus described the invention, what is claimed as new is- Incombination, a support, a feed-screw arranged upon the support, a headcarried by the support movable longitudinally thereof and provided withan opening extending from an end thereof, an adjusting element mountedin the opening aforesaid and provided with a transverse elongatedopening receiving the feed-screw, a portion of said elongated openingbeing threaded, an adjusting-stem threaded into the opening formed inthe head and having swivel connection with the adjusting element abovementioned to admit of adjustment of said element relative to thefeed-screw for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES M. LoYD. [L. S.]

Witn esses ISABEL BARNHART, EMMA BARNHART.

